Venetian blind cord lock



Oct. 13, 1942. H. K. LORENTZEN VENETIAN BLIND CORD LQCK Original Filed-Aug. 17, 1940 'IIIIIIIIIIIIIIIII 2 INVENTOR HANS K. LORE/VTZEN IATTORNEYS Patented Oct. 13, 1942 VENETIAN BLIND com) LOCK Hans K.Lorentzen, Montclair, N. J., assignor to Lorentzen Hardware M! Corp, NewYork, N. Y., a corporation of New York Original application August 17,1940, Serial No. 353,020. Divided and this application June 26,

1942, Serial No. 448,589

6 Claims.

This invention relates to Venetian blind cord locks used for locking theelevator or lift cords of Venetian blinds. Originally the subject-matterwas presented in my application Serial No. 353,020, filed August 17,1940, of which this is a division.

General objects of the invention are to provide a Venetian blind cordlock of increased simplicity, to lower the manufacturing cost of suchcord locks, to eliminate certain manufacturing operations in connectionwith such cord locks, and to improve the operating characteristics ofthe cord locks.

Various other and specific objects of the invention will be apparent tothose skilled in the art from the following disclosure.

Fig. l of the drawing is a fragmentary front elevation showing thepresent invention in conjunction with a Venetian blind.

Fig. 2 is a vertical section taken approximately on the line 22 of Fig.l, certain parts being omitted.

Fig. 3 is a fragmentary sectional view taken in general on the line 33of Fig. 2.

Fig. 4 is a perspective view of the locking dog.

The cord lock is included in a combination cord lock and tilt barbracket I0. is attached to the head-bar 1 in a well-known manner, andhas a depending leg I6 which rotatably supports the gudgeon pin l thatprojects from the end of the tilt bar l2. Suspended from the tilt bar ina conventional manner are the conventional articulated slats l1 of theblind; and conventionally arranged lift cords l8 and I9 are provided forraising and lowering the blind.

The cord lock includes a stamped U-shaped sheet-metal casing 45 of ageneral form which is already known. The mouth of the U-formation isprovided with integral projections which pass through openings inbrackets l6 and are riveted thereto, e. g. at 3 in Fig. 3. Each side ofthe U-formation is provided with a wedgeshaped cut-out or notch such asshown at 46 in Fig. 3. A locking dog 41 is provided with a toothed edge4 and is arranged to rock in the casing 45 to thereby lock and releasethe cords l8 and I9. Projecting laterally from both sides of locking dog41 are fiat extensions 48, 48 best seen in Figlilt In assembly, theseextensions 48, 48 are inserted in notches 46 and then the U- shapedcasing is assembled with and secured to the bracket l6. Thus the bracketl6 acts as a bridge member to close the notches 46 and keep the dog 41in assembled position.

This bracket It will be noted that the flat extensions 48, 46 fitloosely into the notches 46 so as to permit rocking movement of the dog41. With the cord swung against the teeth at 4 on the lower edge of thedog, slight upward movement of the cord rocks the dog upwardly andcauses the cord to be wedged against the bump 5 in the casing 45 and tolock the cord in a manner well understood in the art. With the dog 41 inlocking position, a slight downward pull on the cords I8 and I9 causesthe dog to be released and to drop into the position shown in Fig.3. Thedog 41 'may be a simple sheet metal stamping made in one operation andhaving integral therewith the teeth at 4 and the fiat extensions 48, 48.The size and dimensions of wedge-shaped notches 46, 46 are soproportioned with respect to the fiat extensions 48 that the notchescooperate with the extensions to arrest the dog at the desired stage ofits downward or released movement. This arrested position is shown inFig. 3.

The present invention is in some respects an improvement upon the cordlock shown in Lorentzen Patent 2,075,214 of March 30, 1937, andreference may be had to that patent for a more complete disclosure ofcertain structural features ancillary to the present invention.

In compliance with the patent statutes, I have disclosed the best formin which I have contemplated applying my invention, but it will beunderstood that the disclosure is illustrative of the invention ratherthan limiting the scope of the same.

What I claim is: V

1. In a Venetian blind fitting of the type in which a U-shaped cord lockcasing has a 1ocking dog rockably mounted therein and has the mouth ofthe U-formation secured to a tilt bar bracket, the improvement whichcomprises: the locking dog being provided with integral extensions onwhich it rocks, the opposite sides of the U-formation being providedwith notchesinto which the extensions are inserted, and said bracketacting to close the ends of said notches and thereby hold the dog in'assembled position in the U-shaped casing.

2. In a Venetian blind fitting of the type in which a U-shaped cord lockcasing has a locking dog rockably mounted therein and has the mouth ofthe U-formation secured to a tilt bar bracket, the improvement whichcomprises: the locking dog being provided with integral flat extensionson which it rocks, the opposite sides of the U-formation being providedwith notches of wedgeshaped form into which the extensions are inserted,and said bracket acting to close the ends of said notches and therebyhold the dog in as- 7 sembled position in the U-shaped casing.

3. In a- Venetian blind fitting of the type in which a hollow cord lockcasing has a locking dog rockably mounted therein to move incordengaging and cord-release directions the improvement whichcomprises; the locking dog be ing provided with extensions on which itrocks;v

and the casing being provided with cut-outs '5. In a Venetian blindfitting of the type m which a U-shaped cord lock casing has a lockingdog rookably mounted therein and has the mouth i of the U-formationtraversed by a bridge member,

the improvement which comprises:- the locking dog being provided withextensions on which it rocks, the opposite sides of the U-formation being provided with notches into which the extensions are inserted, andsaid bridge member act which loosely receive the extensions and actconjunction therewith to limit the movement of Y the dog in cord-releasedirection.

4. In a Venetian blind fitting of the type in which a hollow cord lockcasing has a locking dog rockably mounted therein to move in cord-engaging and cord-release directions, the improvement which comprises: thelocking dog being pro-- vided with flat integral extensions on which itrocks, and the casing being provided with wedgeshaped cut-outs whichloosely receive the exten-v sions and act in conjunction with the edgesof the extensions to limit the movement of the dog in cord-releasedirection.

ing to close the ends of said notches and thereby -hold the dog inassembled position in the U- shaped casing.

6. In a Venetian blind fitting of the type in Y which a U-shaped cordlock casing has a. locking HANS K. LORENTZEN.

